#!/usr/bin/env python3
# Apache License, Version 2.0

import argparse
import os
import shlex
import shutil
import subprocess
import sys

def setup():
    import bpy

    for scene in bpy.data.scenes:
        scene.render.engine = 'BLENDER_EEVEE'

    # Enable Eevee features
    scene = bpy.context.scene
    eevee = scene.eevee

    eevee.use_soft_shadows = True

    eevee.use_ssr = True
    eevee.use_ssr_refraction = True

    eevee.use_gtao = True
    eevee.gtao_distance = 1

    eevee.use_volumetric_shadows = True
    eevee.volumetric_tile_size = '2'

    for mat in bpy.data.materials:
        # This needs to be enabled case by case,
        # otherwise we loose SSR and GTAO everywhere.
        # mat.use_screen_refraction = True
        mat.use_sss_translucency = True

    # Workaround for crash with Mantaflow (T73921).
    use_light_cache_bake = True
    for ob in bpy.data.objects:
        for mod in ob.modifiers:
            if mod.type == 'FLUID':
                use_light_cache_bake = False

    cubemap = None
    grid = None
    # Does not work in edit mode
    try:
        # Simple probe setup
        bpy.ops.object.lightprobe_add(type='CUBEMAP', location=(0.5, 0, 1.5))
        cubemap = bpy.context.selected_objects[0]
        cubemap.scale = (2.5,2.5,1.0)
        cubemap.data.falloff = 0
        cubemap.data.clip_start = 2.4

        bpy.ops.object.lightprobe_add(type='GRID', location=(0, 0, 0.25))
        grid = bpy.context.selected_objects[0]
        grid.scale = (1.735,1.735,1.735)
        grid.data.grid_resolution_x = 3
        grid.data.grid_resolution_y = 3
        grid.data.grid_resolution_z = 2
    except:
        pass

    try:
        # Try to only include the plane in reflections
        plane = bpy.data.objects['Plane']

        collection = bpy.data.collections.new("Reflection")
        collection.objects.link(plane)
        # Add all lights to light the plane
        if invert == False:
            for light in bpy.data.objects:
                if light.type == 'LIGHT':
                    collection.objects.link(light)

        # Add collection to the scene
        scene.collection.children.link(collection)

        cubemap.data.visibility_collection = collection
    except:
        pass

    eevee.gi_diffuse_bounces = 1
    eevee.gi_cubemap_resolution = '128'
    eevee.gi_visibility_resolution = '16'
    eevee.gi_irradiance_smoothing = 0

    if use_light_cache_bake:
        bpy.ops.scene.light_cache_bake()


# When run from inside Blender, render and exit.
try:
    import bpy
    inside_blender = True
except ImportError:
    inside_blender = False

if inside_blender:
    try:
        setup()
    except Exception as e:
        print(e)
        sys.exit(1)


def get_arguments(filepath, output_filepath):
    return [
        "--background",
        "-noaudio",
        "--factory-startup",
        "--enable-autoexec",
        filepath,
        "-E", "BLENDER_EEVEE",
        "-P",
        os.path.realpath(__file__),
        "-o", output_filepath,
        "-F", "PNG",
        "-f", "1"]


def create_argparse():
    parser = argparse.ArgumentParser()
    parser.add_argument("-blender", nargs="+")
    parser.add_argument("-testdir", nargs=1)
    parser.add_argument("-outdir", nargs=1)
    parser.add_argument("-idiff", nargs=1)
    return parser


def main():
    parser = create_argparse()
    args = parser.parse_args()

    blender = args.blender[0]
    test_dir = args.testdir[0]
    idiff = args.idiff[0]
    output_dir = args.outdir[0]

    from modules import render_report
    report = render_report.Report("Eevee", output_dir, idiff)
    report.set_pixelated(True)
    report.set_reference_dir("eevee_renders")
    report.set_compare_engines('eevee', 'cycles')
    ok = report.run(test_dir, blender, get_arguments, batch=True)

    sys.exit(not ok)


if not inside_blender and __name__ == "__main__":
    main()
